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The tank higher than the burner A (Fig. 17)
The distance "P" must not exceed 10 meters in order to avoid
subjecting the pump's seal to excessive strain; the distance "V"
must not exceed 4 meters in order to permit pump self-priming
even when the tank is almost completely empty.
The tank lower than the burner B (Fig. 17)
Pump depression values higher than 0.45 bar (35 cm Hg) must
not be exceeded because at higher levels gas is released from
the fuel, the pump starts making noise and its working life-span
decreases.
It is good practice to ensure that the return and suction lines enter
the burner from the same height; in this way it will be more im-
probable that the suction line fails to prime or stops priming.
Useful suggestions for both systems (A) and (B):
– Use copper pipes whenever possible.
– Any curves used in the system should be made with the widest
possible radius.
– Use biconic connectors at both ends of the pipe.
– Whenever the burner is installed in areas with extremely cold
winter climates (temperatures lower than -10°C), we recom-
mend insulating both the tank and the piping. Avoid the small-
est of the three pipe diameters provided in the Table and lay
the piping along the most sheltered route possible. The paraf-
fin in the fuel begins to solidify below 0°C, and the filters and
nozzle begin to clog accordingly.
– Install a filter on the suction lines with a transparent plastic
bowl if possible in order to permit the regular flow of fuel and
quick checking of the state of the filter.
– The return pipe does not require an on/off valve, but if the user
desires to insert one, a lever-type valve should be selected
which clearly indicates when the valve is open or closed (if the
burner starts with the return pipe closed, the sealing organ lo-
cated on the pump shaft will break).
– The opening of the burner or the boiler door must not twist the
hoses that connect the copper pipes to the pump.
– If more than one burner is operating in the same room, each
one must be equipped with its own suction pipe; the return
pipe may be shared by all, providing it is sufficiently sized.
– The suction line must be perfectly airtight. In order to check the
seal, close the pump's return line. Install a union T on the vac-
uum meter attachment. On one branch of this T install a pres-
sure gauge and on the other branch inject air at a pressure of
1 bar. After the air injection, the gauge must remain at a con-
stant pressure.
20033097
Installation
11
7
10
9
6
11
7
6
Key (Fig. 17)
H
Pump/Foot valve height difference
L
Piping length
• values calculated for gas oil:
• viscosity = 6 cSt/20°C
• density = 0.84 kg/dm
• temperature = 0°C
• max altitude = 200 m (a.s.l.)
ø
Inside pipe diameter
1
Burner
2
Pump
3
Filter
4
Manual on/off valve
5
Suction line
6
Foot valve
7
Rapid closing manual valve remote controlled (only Italy)
8
On/off solenoid valve (only Italy)
9
Return line
10
Check valve (only Italy)
11
Tank filter
+ H
- H
(m)
+ 4,0
+ 3,0
+ 2,0
+ 1,0
+ 0,5
0
- 0,5
- 1,0
- 2,0
- 3,0
- 4,0
20
GB
A
5
8
2
4
5
3
9
B
S8273
3
L (m)
Ø (mm)
8
10
35
90
30
80
26
69
21
59
19
53
17
48
15
43
13
37
9
27
4
16
-
6
1
Fig. 17
12
152
152
152
130
119
108
97
86
64
42
20
Tab. H
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